This study examines the correlation between the tensile strength of ramie (Boehmeria Nivea) yarn at different gauge lengths under uniaxial static tensile loading. The stress–strain curves for each gauge length were inconsistent due to the non-uniformity of the ramie yarn diameter. Strain hardening and multiple load drops were seen on the stress–strain curves, which is beneficial for structural applications where performance and safety are a significant concern. When the gauge length increases, the tensile strength decreases due to more defects, which act as stress concentration on the fibres. This behaviour also confirms that the size effect plays a role in ramie fibres. The large variability of more than 10% in the ramie fibres should be taken as a precaution when designing structural parts made of this material.